title: Is there any correlation between the ATS, BTS, ERS and GOLD COPD's severity scales and the frequency of hospital admissions?
mesh_terms: D005541:Forced Expiratory Volume / Q000502:physiology; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D010100:Oxygen / Q000627:therapeutic use; D017410:Practice Guidelines as Topic / Q000592:standards*; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000145:classification* / Q000503:physiopathology / Q000628:therapy; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index
chemical_list: D010100:Oxygen